Clifford Headers for a 225?

Naw. Clifford USED to make a few different types. Now all they make are the shorties. They made a 6 into 1 long tube style and a dual 3 into 2 years ago but now only the shorties. They went up from 349 to 399 just this year.
Any reason the $90 exhaust manifolds back on eBay say they won’t fit pre70’s slants?